Find Zoom level in WebMap

WilliamFerster — Thu, 08 Aug 2019 22:06:58 GMT

I am loading a Webmap made with ArcGIS online.

I can get the center from map.portalItem.extent, but how do I find the zoom?

app.map=new WebMap({ portalItem: { id: myId }});

app.map.load().then(function() {

app.center[0]=app.map.portalItem.extent.center.longitude;

app.center[1]=app.map.portalItem.extent.center.latitude;

app.zoom=???

});

...

app.mapView.when(function() { app.activeView.goTo({ center:app.center, zoom: app.zoom }) });

topic Find Zoom level in WebMap in HTML5, CSS, JavaScript, and JavaScript Frameworks